From: Antonio Soares (amsoares@netcabo.pt)
Date: Wed Apr 18 2007 - 11:34:56 ART
Hello Muthu,
Yes, it seems control packets are enabled by default and we need to disable
them explicity to be able to set the destination port:
!
ip sla monitor 1
type udpEcho dest-ipaddr 10.10.10.255 dest-port 2000 source-port 8888
control disable
timeout 2
frequency 1
ip sla monitor schedule 1 life forever start-time now
!
Debub ip packet detail:
*Apr 23 12:34:03.636: IP: tableid=0, s=6.6.6.6 (local), d=10.10.10.255
(FastEthernet0/0), routed via RIB
*Apr 23 12:34:03.636: IP: s=6.6.6.6 (local), d=10.10.10.255
(FastEthernet0/0), len 44, sending
*Apr 23 12:34:03.636: UDP src=8888, dst=2000
This is new for me. Thank you very much.
Regarding the Multicast Helper-Map, i always have some dificulties when i
need to choose the interfaces where "ip directed-broadcast" should be
enabled. But i will review Beau's book section that covers the topic.
Regards,
Antonio
-----Original Message-----
From: Muthuraja Ayyanar (mayyanar) [mailto:mayyanar@cisco.com]
Sent: quarta-feira, 18 de Abril de 2007 15:09
To: Antonio Soares; ccielab@groupstudy.com
Subject: RE: Multicast Helper-Map Question and Verification
Hello Antonio,
Try and disable the control packet when u define the SLA monitor config
and see if SLA starts to send out traffic on the desired port.
UDP 1967 is SLA control traffic. By default control packet generation
will be enabled and it's applicable for both TCP/UDP related probes.
ICMP doesn't use the control packets in my limited testing.
If u desire control packets between the source and the responder, u have
to enable ip sla monitor responder on the receiver side.
With regards to the ip multicast helper-map, there is a good generic
explanation of this feature in "Beau Williamson's" Developing IP
Multicast Network, last chapter I guess. I did a search on the
groupstudy and I see there are a quite lot of threads on this. I am in
the middle of testing this and will share my observation upon
completion.
Regards,
Muthu
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Antonio Soares
Sent: Tuesday, April 17, 2007 4:31 PM
To: ccielab@groupstudy.com
Subject: Multicast Helper-Map Question and Verification
Dear GS,
Two questions about Multicast Helper-Map:
Given the topology:
SOURCE==F0/0==router r1===S1/0===S1/0===router r2===F0/0===RECEIVER
SOURCE is sending UDP/2000 broadcast traffic.
Question #1:
-----------
Where should i enable "ip directed-broadcast" ?
Question #2:
-----------
How can we test if we have a working configuration ?
Regarding Question #1, i think we only need to enable it on both
FastEthernet Interfaces:
+++++++++++++++++++++++++++
r1(config)#int f0/0
r1(config-if)#ip multicast helper-map broadcast 224.24.24.24 udp-2000
r1(config-if)#ip pim dense-mode r1(config-if)#ip directed-broadcast
r1(config)#int s1/0
r1(config-if)#ip pim dense-mode
r1(config)#ip access-list extended udp-2000 r1(config-ext-nacl)#permit
udp any any eq 2000
r1(config)#ip forward-protocol udp 2000
+++++++++++++++++++++++++++
r2(config)#int s1/0
r2(config-if)#ip multicast helper-map 224.24.24.24 10.10.10.255 120
r2(config-if)#ip pim dense-mode
r2(config)#int f0/0
r2(config-if)#ip pim dense-mode
r2(config-if)#ip directed-broadcast
r2(config)#ip access-list extended udp-2000 r2(config-ext-nacl)#permit
udp any any eq 2000
r2(config)#ip forward-protocol udp 2000
+++++++++++++++++++++++++++
Regarding Question #2, i tried to use IP SLA but i get a weird
behaviour.
The udp destination port is always 1967:
!
ip sla monitor 1
type udpEcho dest-ipaddr 10.10.10.255 dest-port 2000 source-port 9999
timeout 2 frequency 1 ip sla monitor schedule 1 life forever start-time
now !
Debug ip packet detail:
*Apr 22 21:21:20.739: IP: tableid=0, s=6.6.6.6 (local), d=10.10.10.255
(FastEthernet0/0), routed via RIB *Apr 22 21:21:20.739: IP: s=6.6.6.6
(local), d=10.10.10.255 (FastEthernet0/0), len 80, sending
*Apr 22 21:21:20.739: UDP src=9999, dst=1967
Now with destination port=3000 and source port=8888:
ip sla monitor 1
type udpEcho dest-ipaddr 10.10.10.255 dest-port 3000 source-port 8888
timeout 2 frequency 1 ip sla monitor schedule 1 life forever start-time
now !
Debug ip packet detail:
*Apr 22 21:23:47.883: IP: tableid=0, s=6.6.6.6 (local), d=10.10.10.255
(FastEthernet0/0), routed via RIB *Apr 22 21:23:47.883: IP: s=6.6.6.6
(local), d=10.10.10.255 (FastEthernet0/0), len 80, sending
*Apr 22 21:23:47.883: UDP src=8888, dst=1967
The source port is correctly changed but the destination port is always
1967...
Thanks.
Antonio
This archive was generated by hypermail 2.1.4 : Tue May 01 2007 - 08:28:36 ART